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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260618T120000
DTEND;TZID=Europe/Madrid:20260618T130000
DTSTAMP:20260614T012449
CREATED:20260603T095532Z
LAST-MODIFIED:20260604T123328Z
UID:25147-1781784000-1781787600@www.ift.uam-csic.es
SUMMARY:Strings\, Pheno and the Swampland (SPS) Journal Club
DESCRIPTION:Every Thursday at 12:00 in the Red Room.
URL:https://www.ift.uam-csic.es/event/strings-pheno-and-the-swampland-sps-journal-club-4/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260618T170000
DTEND;TZID=Europe/Madrid:20260618T180000
DTSTAMP:20260614T012449
CREATED:20260603T094731Z
LAST-MODIFIED:20260604T124507Z
UID:25140-1781802000-1781805600@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Large scale perturbations in the open universe'
DESCRIPTION:Mikel Martin (IFT) will present “Large scale perturbations in the open universe”\, by  D. H.  Lyth\, &  A. Woszczyna\, \nVenue&Time: Blue Room / 17:00 \nAbstract:\nWhen considering perturbations in an open (Omega<1) universe\, cosmologists retain only sub-curvature modes (defined as eigenfunctions of the Laplacian whose eigenvalue is less than -1 in units of the curvature scale\, in contrast with the super-curvature modes whose eigenvalue is between -1 and 0). Mathematicians have known for almost half a century that all modes must be included to generate the most general HOMOGENEOUS GAUSSIAN RANDOM FIELD\, despite the fact that any square integrable FUNCTION can be generated using only the sub-curvature modes. The former mathematical object\, not the latter\, is the relevant one for physical applications. The mathematics is here explained in a language accessible to physicists. Then it is pointed out that if the perturbations originate as a vacuum fluctuation of a scalar field there will be no super-curvature modes in nature. Finally the effect on the cmb of any super-curvature contribution is considered\, which generalizes to Omega<1 the analysis given by Grishchuk and Zeldovich in 1978. A formula is given\, which is used to estimate the effect. In contrast with the case Omega=1\, the effect contributes to all multipoles\, not just to the quadrupole. It is important to find out whether it has the same l dependence as the data\, by evaluating the formula numerically.
URL:https://www.ift.uam-csic.es/event/old-journal-club/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
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